Hammer-drill.



C. C. HANSEN.

HAMMER DRILL.

APPLICATION FILED 33.23. 1909.

Patented Jan. 13, 1914.

'UNITED STATES PTENT FFXGE..

CHARLES C.. HANSEN,

OF EASTON, PENNSYLVANIA, ASSIGNOR TO INGERSOLL-RAI'D CMPANY, OF NEW YORK, N. Y., A CORPORATION 0F NEW JERSEY.

HAMMER-DRILL.

Toy all' whom t may concern Be it known that I, @HARLES C. HANSEN., a citizen of the United States, and a resi? dent of Easton, in the county of Northampton and Sta-te oi? Pennsylvania, have invented a new and useful Improvement in Hammenrills, of which the following is a speciication. y

rllhis invention relates to improvements in hammer drills and is more particularly directed to certain improvements in rotation devices therefor.

The object of this invention is to provide a piston having its hammer extension provided with oppositely arranged spiral tongue 'and grooved'connections with the rotation ring and the drill steel holding chuck respectively, thus permitting the drill to be made with fewer Aparts and more compact than heretofore and also permitting the oppositely arranged spiral tongue .and grooved connections to be made with a less spiral turn than heretofore tor a predetermined rotary movement of the drill steel.

In the accompanying drawings, Figure 1 represents al hammer drill iny longitudinal central section showing one form of the invention, Fig. 2 is a similar view of a portion of the drill with the hammer piston remved, Fig. 3 is a transverse section taken in the plane of the line A-A of Fig. 1, looking in the direction of the arrows, and Fig. 4 is a transverse section taken in the plane of the line B-B of Fig. l, looking in the direction of the arrows. 1

rlhe hammer drill cylinder is denoted by 1 and its reciprocating piston by 2.

The drill steel is denoted by 3. The drill steel chuck el rotatably mounted in a iront extension 5 of the drill cylinder. The drill steel is locked to turn with the chuck in any desired manner, as for instance, by providing the drill steel with an angular portion and the chuck with an angular socket fitted to receive the said. angular portion of' the drill steel. rEhe inner end of .the 'drill steel 3 projects into an enlarged bore G at the inner end of the chuck 5 where .the said drill steel may receive the impact from the hammer extension 7 oi. the piston 2. lA nut 8 is .screwed into the enlarged bore G of the chuck, which nut has a tongue and grooved connection witl thel hammer' extension 7 of the piston. A cylinder head 9 isinterposed between the extension 5 and .the

vSpecieation of Letters Patent. Apyiication filed February 23, 1909.

- and has llatented dan. illjitllel. serial no. 479,324.

cylinder 1, through which head the hammer extension 7 is fitted to'slide. A rotation ring 10 is located within the extension 5 adjacent to the 'head 9, which rotation' ring permitted a rotary movement in one direetion and held against movement. in the op-v posite direction by a pawl and ratchet connection with the extension 5, in the present instance by providing the ring with an annular series of ratchet teethlll and the extension 5 with spring pressed'pavhls 12. A nut 13 is screwed into the rotation ring 10 a tongue and 4grooved connection with the hammer extension 7 of the piston 2.

In the form shown, the hammer extension is provided with oppositely arranged spiral tongue and grooved connections with the rotation ring and chuck, respectiv'ly, in the present instance'loy providing thi nuts and 8 of the rotation ring and chucr, respectively, with oppositely arranged spiral tongues 14, 15, litted to enter oppositely arn ranged long and short spiral grooves 16, 1'?, respectively formed in the hammer extension 7 of the piston. This oppositely ranged spiral tongue and grooved connection between the piston hammer extension and the rotation ring and chuck, respec-g tively, will .impart a step by step rotary movement in one direction to the drill steel as the piston reciprocates, owing to the fact that the rotation ring is held against rotary movement in one direction while permitted to rotate in the opposite direction. By arranging these tongue and grooved connec tions in opposite directions, a predetermined amount of rotary movement to the drill steel mayl be obtained by a very small amount ol' -turn in each of the spiral tongue and Igrooved connections and thus materlially reA duce the wear on the parts. ,I

The rotation device if'or hammer drills, as herein shown and described, is very simple and compact and materially lessons the .length of the tool hy utilizing the piston hammer extension as a common means for providino` a. tongue and. grooved connection with boti `the rotation ring and the drill steel chuck. Furthermore, the parts are so arranged that access thereto may be readily obtained for purposes of examination and renewal,

W hat l claim is:-- 1. In a hammer'drill, a rotation ring, a

`hollow chuck and a piston havinga reduced hummer extension projecting through the ring` into the bore of the chuck, saidhummer extension having oppositely arranged spiral tongue und grooved connections with the ring and bore of the chuck, respectively.

2. ln ti hummer drill, a rotation ring ha'v ing zi nut, a chuck having a nut und :i piston having a hammer extension provided with oppositely arranged tongue and grooved connections with the said nuts.

3. ln u hummer drill, :i rotation ring having' u nut spirally tongued interiorly in one direction, u chuck` havinga nut spirzilly tongued interiorly in the opposite direction and a piston having a hammer extension spirully grooved in opposite directions for engagement by the tongues on the first and second named nuts, respectively,

4f. In e. hammer drill, a cylinder, a cylin CHARLES C. HANSEN T"Vitnesses:

S. H. Primm-R, ARTHUR J. SHIMER. 

